CN112736872B - Power distribution network protection control strategy optimization method based on real-time analysis of operation mode - Google Patents
Power distribution network protection control strategy optimization method based on real-time analysis of operation mode Download PDFInfo
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
- H02H7/28—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured for meshed systems
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Abstract
The invention relates to the technical field of power distribution networks, and discloses a power distribution network protection control strategy optimization method based on real-time analysis of an operation mode, which comprises real-time topology analysis, real-time action analysis and real-time benefit analysis.
Description
Technical Field
The invention relates to the technical field of power distribution networks, in particular to a power distribution network protection control strategy optimization method based on real-time analysis of an operation mode.
Background
With the continuous development of the scale of the power distribution network and the wide access of new energy, the operation mode of the power distribution network is more complex and changeable, on one hand, the increasing and drawing-out effects after the access of the distributed power supply bring great tests to the selectivity and sensitivity of the traditional power distribution network protection, and on the other hand, the active management strategy of the power distribution network makes the power distribution network face the change of network topology;
in the existing method, aiming at the complicated operation wiring of the power distribution network and the management and control effect of an active power distribution network, an online tracking operation mode method is mainly adopted to coordinate the optimization of protection control fixed values and the strategy decision problem, the online tracking of the power distribution network operation mode needs to acquire the change of the switch position state of the power distribution network in time, and different position state combinations are reflected in different operation modes, so that a plurality of sets of protection fixed values are required to be preset to be suitable for different operation modes and application scenes, and if the operation mode is not changed within a certain time span, the method can theoretically meet the tracking requirement of the power distribution network operation mode;
however, the online operation mode is tracked, only the topological wiring before the fault is followed, and although the optimization of the protection control strategy under all operation conditions of the power distribution network can be adapted, all fault scenes still need to be considered for the protection constant value and the decision, the difference of real-time operation characteristics caused by the fault is not taken into account, the constant value decision cannot be improved according to the difference of the real-time operation characteristics caused by the fault, the optimal decision of the constant value and the decision cannot be made, the optimization space still exists in the protection control strategy, the fault real-time characteristics need to be fully mined, and therefore the export decision, the time sequence coordination and the power restoration selection of the protection control are improved.
Disclosure of Invention
Technical problem to be solved
Aiming at the defects of the prior art, the invention provides a power distribution network protection control strategy optimization method based on real-time analysis of an operation mode, which has the advantages of fully considering configuration parameters, state parameters and operation parameters, realizing the real-time analysis of the operation mode, including topology analysis, action analysis and benefit analysis, and realizing operability condition judgment of a switch, timing sequence constant value optimization of protection and reclosing strategy selection to realize protection control strategy optimization.
(II) technical scheme
In order to achieve the purpose, the invention provides the following technical scheme: a power distribution network protection control strategy optimization method based on real-time analysis of an operation mode comprises real-time topology analysis, real-time action analysis and real-time benefit analysis, and comprises the following steps:
1) After the system configuration is completed, acquiring configuration parameters of the system, wherein the configuration parameters are used for describing the inherent connection relation and the element composition of the system;
2) Acquiring state parameters of the system according to the change of the system operation mode, wherein the state parameters are used for feeding back the influence of the operation mode change on a protection control strategy, and realizing an online protection fixed value setting and control decision scheme based on operation mode analysis;
3) Acquiring system operation parameters according to real-time fault conditions: monitoring the protected fault judgment signal in real time to realize real-time analysis of the operation mode;
4) Analyzing real-time network topology according to the protected fault judgment signal, and carrying out real-time switch action capacity analysis: namely, whether the switch has the fault removing capability under the current fault condition or not is judged, namely, the operability condition is judged;
5) Analyzing the matching direction of the protection unit according to the fault position, the fault judgment signal actually obtained by the protection of each unit and the operability condition judgment of the switch, and optimizing the fixed value on the time sequence to form a time sequence fixed value strategy for protection;
6) Combining calculation of reclosing benefits to obtain a power restoration strategy for protection control;
preferably, the first and second liquid crystal materials are,
the real-time topology analysis-based switch operability judgment specifically comprises the following steps:
judging the operability of a switch based on real-time topology analysis, firstly obtaining the operability of the switch of the power distribution network according to the position displacement condition of the switch of the power distribution network, and determining the topology connection relation before failure; on the basis, the distribution network fault identification information, namely the real-time fault information analysis result given by the distribution network protection identification element, is combined to determine the distribution of fault points, and finally, the operability analysis of the switch is realized according to the relation between the switch and the power supply and the fault points, specifically:
s1, describing an inherent connection relation between a switch and an element by means of a topological model node model of a network to form a node-branch communication relation matrix of the network;
s2, correcting the elements of the node-branch connection relation matrix by means of the opening and closing state information of the switch;
s3, determining fault points according to fault identification information of the protection unit, taking the fault points as reference, combining the corrected node-branch connection relation matrix, and calculating the distance between the switches by means of graph theory knowledge such as a spanning tree algorithm or a minimum path algorithm;
s4, researching the relation between the switch and the power supply and the fault point according to the real-time switch distance: and judging the switching distance between each switch and the power supply point and the fault point, and when the sum of the distance between each switch and the fault point and the distance between each switch and the power supply point is equal to the distance between the power supply point and the fault point, indicating that the switch is between the power supply point and the fault point, wherein the operability of the switch is related to the characteristics of the power supply.
Preferably, the real-time action analysis specifically includes:
protection timing sequence fixed value optimization based on action analysis
The protection units need time sequence coordination to guarantee the selectivity of actions, the number/range of the protection units needing coordination determines the time sequence coordination result of protection, and the implementation method of the fixed value optimization of the protection time sequence is as follows:
s1, determining the position of a fault point according to a fault judgment result of a protection unit, and determining a switching distance between the protection unit and the fault point according to real-time network topology analysis;
s2, judging whether each protection unit gives a fault judgment result or not, and judging whether each switch unit meets the operability conditions or not, wherein the protection unit is regarded as a protection range set needing to be matched only when the protection unit meets the two groups of conditions simultaneously;
s3, determining the action time sequence of protection according to the protection coordination range set: starting from the switching distance of 1, determining whether all the protections with the switching distance exist in the protection units belonging to the protection coordination range set, and if so, increasing the action time of a step level; and analogizing until the maximum switch distance position, and when the protection of a certain switch distance is not in the protection coordination range set, reducing the corresponding action delay in the time sequence, thereby ensuring the coordination optimization of the protection in the time sequence.
Preferably, the real-time benefit analysis specifically includes:
reclosing strategy based on benefit analysis
Reclosing effectively avoids the phenomenon of long-time power failure caused by instantaneous faults, but slows down the power restoration process under the condition of permanent faults, faults occur on different elements, whether reclosing is adopted or not affects the overall power restoration benefit differently, therefore, the power restoration benefit is substantially related to the operation mode of a power distribution network and fault distribution point, and the specific benefit analysis and reclosing decision selection realization process is as follows:
s1, determining a network topology before a fault, a network topology after the fault under a reclosing strategy and a network topology after the fault under a switching-over strategy based on topology analysis and action analysis under a fault condition;
s2, analyzing the load conditions under the two fault processing modes according to the network topology before the fault and the network topology after the fault under the two fault processing modes, wherein the load conditions comprise: the load which continuously maintains normal power supply, the load with a power supply transferring condition and a fault power failure load, wherein the load value which maintains normal power supply is the sum of the load quantity which always maintains power supply in the fault process and the total number of loads connected in the system, and the load size which is separated by the main power supply tripping operation is subtracted; the load value with the transfer condition is the sum of the load amount of temporary power supply maintained by main system recovery and distributed power supply and effective transfer through a standby power supply line after the fault point is effectively isolated;
s3, comprehensively weighing the power recovery benefits according to the power transfer duration, the overhaul duration, the instantaneous fault probability and the load loss duration, and judging whether power recovery strategies such as reclosing and the like are adopted or not according to the power recovery benefit value;
(III) advantageous effects
Compared with the prior art, the invention provides a power distribution network protection control strategy optimization method based on real-time analysis of an operation mode, and the method has the following beneficial effects:
according to the power distribution network protection control strategy optimization method based on real-time analysis of the operation mode, parameters such as configuration parameters, state parameters and operation parameters are fully considered, and by means of topology analysis, action analysis and benefit analysis considering operation parameters, operability condition judgment of a switch, time sequence constant value optimization of protection and reclosing strategy selection are achieved to achieve protection control strategy optimization.
Drawings
FIG. 1 is a system block diagram of the architecture of the present invention;
FIG. 2 is a block flow diagram of the architecture of the present invention.
Detailed Description
In order to better understand the purpose, structure and function of the present invention, the following describes a power distribution network protection control strategy optimization method based on real-time analysis of an operation mode in further detail with reference to the accompanying drawings.
Referring to fig. 1-2, the present invention relates to a method for optimizing protection control strategy of power distribution network based on real-time analysis of operation mode,
principle of the invention
The customization of the protection constant value and the control strategy depends on the characteristic distribution of the fault, the characteristic distribution of the fault is influenced by the operation mode of the power system, the change of the fault condition can cause the change of the fault characteristic except the operation mode of the power system, and the maximum optimization of the protection constant value and the control strategy can be realized only by fully considering the operation mode and the fault condition.
Therefore, the optimization of the protection constant value and the control strategy needs to be upgraded to the real-time analysis of the operation mode on the basis of the traditional online analysis of the operation mode, so that the protection constant value is adjusted to the real-time setting mode from the online setting by the control strategy.
The operation mode of the power distribution network is analyzed in real time, and the following analysis conditions need to be mastered.
1) System configuration parameters: the network connection and the source load deployment of the power system are represented, and in consideration of the complexity of the switch configuration of the power distribution network, in other words, the switch equipment of the power distribution network comprises a plurality of types such as circuit breakers, load switches and isolating switches, on the other hand, for the power distribution network containing the distributed power sources, the types and the characteristics of the distributed power sources also need to be reflected. Therefore, the system configuration description of the operation mode of the power distribution network needs to embody the switch type and the distributed power supply element;
2) The system state parameter is: the method is characterized in that the state of the switch position of the power system is represented, different from system configuration parameters, system state parameters change along with the operation of the power system, and a monitoring unit is required to feed back the change information of the switch position in time;
3) And (3) system operation parameters: the system operation parameter is the difference between the operation mode on-line tracking and the operation mode real-time tracking, and is represented as a protection control decision signal triggered by a fault event under a given state parameter, for example, for a protection element, the protection element generates a fault judgment signal (the fault judgment signal does not pass through an outlet loop, so that the switch state does not change within the time scale), and compared with a switch state change signal, the system operation parameter is operation information of a smaller time scale. Grasping this part of the operating parameters can improve the coordination between the protection and realize a more optimal action decision of the switch.
The system configuration parameters, the system state parameters and the system operation parameters jointly form the basis of real-time tracking and analysis of an operation mode, and the method starts from the requirement of a power distribution network on a protection control strategy:
1) The power distribution network protection control strategy should reduce the fault power failure range as much as possible, however, for the power distribution network, the circuit breaker cannot be completely configured, so that the fault removal range cannot be minimized, and the fault removal according to the deployment of the circuit breaker can cause the fault power failure range to be too large. In fact, the load switch also has the capacity of removing a small degree of overcurrent, under the background of accessing the distributed power supply, the load switch can be considered to be adopted to realize the connection of the separated distributed power supply and a fault point, the fault topology is analyzed in real time by fully combining an operation mode and a fault condition, namely combining a system operation parameter, namely a fault identification result of a protection element, the operability condition of the switch can be obtained, and the export decision of protection control is improved;
2) The protection control strategy of the power distribution network is to ensure the isolation of faults as fast as possible, so that the action time fixed values of main protection and backup protection are required to be optimized as far as possible, the specific fault point position is difficult to track in an online tracking operation mode, and the protection matching range is narrowed according to a protection unit (instead of a protection unit of the whole system) which can actually reflect the faults by combining system operation parameters, namely fault identification results of protection elements, and the action time sequence of the protection unit is compressed;
3) The power distribution network protection control strategy should pursue a power supply recovery strategy as excellent as possible, reclosure should cope with the effective power recovery measures of instantaneous faults, the construction of the urban cable network reduces the instantaneous fault occurrence rate and the benefit of reclosure, the self-healing benefits brought by reclosure and power supply switching are different due to different fault positions, and the most reasonable self-healing selection can be made according to specific fault conditions by tracking the operation mode in real time.
The patent implementation process comprises the following steps: the method comprises real-time topology analysis, real-time action analysis and real-time benefit analysis, and comprises the following steps:
1) After the system configuration is completed, acquiring configuration parameters of the system, wherein the configuration parameters are used for describing the inherent connection relation and the element composition of the system;
2) Acquiring state parameters of the system according to the change of the system operation mode, wherein the state parameters are used for feeding back the influence of the operation mode change on a protection control strategy, and realizing an online protection fixed value setting and control decision scheme based on operation mode analysis;
3) Acquiring system operation parameters according to real-time fault conditions: monitoring the protected fault judgment signal in real time to realize real-time analysis of the operation mode;
4) Analyzing real-time network topology according to the protected fault judgment signal, and carrying out real-time switch action capacity analysis: namely, whether the switch has the fault removing capability under the current fault condition or not is judged, namely, the operability condition is judged;
5) Analyzing the matching direction of the protection unit according to the fault position, the fault judgment signal actually obtained by the protection of each unit and the operability condition judgment of the switch, and optimizing the fixed value on the time sequence to form a time sequence fixed value strategy for protection;
6) Combining calculation of reclosing benefit to obtain a power recovery strategy for protection control;
the real-time topology analysis specifically comprises the following steps: switch operability judgment based on real-time topology analysis
Judging the operability of the switch based on real-time topology analysis, firstly obtaining the operability according to the position displacement condition of the switch of the power distribution network, and determining the topological connection relation before the fault; on the basis, the distribution network fault identification information, namely the real-time fault information analysis result given by the distribution network protection identification element, is combined to determine the distribution of fault points, and finally, the operability analysis of the switch is realized according to the relation between the switch and the power supply and the fault points, specifically:
s1, describing an inherent connection relation between a switch and an element by means of a topological model node model of a network to form a node-branch communication relation matrix of the network;
s2, correcting the elements of the node-branch connection relation matrix by means of the opening and closing state information of the switch;
s3, determining fault points according to fault identification information of the protection unit, taking the fault points as reference, combining the corrected node-branch connection relation matrix, and calculating the distance between the switches by means of graph theory knowledge such as a spanning tree algorithm or a minimum path algorithm;
s4, researching the relation between the switch and the power supply and the fault point according to the real-time switch distance: and judging the switching distance between each switch and the power supply point and the fault point, and when the sum of the distance between each switch and the fault point and the distance between each switch and the power supply point is equal to the distance between the power supply point and the fault point, indicating that the switch is between the power supply point and the fault point, wherein the operability of the switch is related to the characteristics of the power supply.
The real-time action analysis specifically comprises the following steps: protection timing sequence fixed value optimization based on action analysis
The protection units need time sequence coordination to guarantee the selectivity of actions, the number/range of the protection units needing coordination determines the time sequence coordination result of protection, and the implementation method of the fixed value optimization of the protection time sequence is as follows:
s1, determining the position of a fault point according to a fault judgment result of a protection unit, and determining a switching distance between the protection unit and the fault point according to real-time network topology analysis;
s2, judging whether each protection unit gives a fault judgment result or not, and judging whether each switch unit meets the operability conditions or not, wherein the protection unit is regarded as a protection range set needing to be matched only when the protection unit meets the two groups of conditions simultaneously;
s3, determining the action time sequence of protection according to the protection matching range set: starting from the switching distance of 1, determining whether all the protections with the switching distance exist in the protection units belonging to the protection coordination range set, and if so, increasing the action time of a step level; and analogizing until the maximum switch distance position, and when the protection of a certain switch distance is not in the protection coordination range set, reducing the corresponding action delay in the time sequence, thereby ensuring the coordination optimization of the protection in the time sequence.
The real-time benefit analysis specifically comprises the following steps: reclosing strategy based on benefit analysis
Reclosing effectively avoids the phenomenon of long-time power failure caused by instantaneous faults, but slows down the power restoration process under the condition of permanent faults, faults occur on different elements, whether reclosing is adopted or not affects the overall power restoration benefit differently, therefore, the power restoration benefit is substantially related to the operation mode of a power distribution network and fault distribution point, and the specific benefit analysis and reclosing decision selection realization process is as follows:
s1, determining a network topology before a fault, a network topology after the fault under a reclosing strategy and a network topology after the fault under a switching-over strategy based on topology analysis and action analysis under a fault condition;
s2, analyzing the load conditions under the two fault processing modes according to the network topology before the fault and the network topology after the fault under the two fault processing modes, wherein the load conditions comprise: the load which continuously maintains normal power supply, the load with a power supply transferring condition and a fault power failure load, wherein the load value which maintains normal power supply is the sum of the load quantity which always maintains power supply in the fault process and the total number of loads connected in the system, and the load size which is separated by the main power supply tripping operation is subtracted; the load value with the transfer condition is the sum of the load amount of temporary power supply maintained by main system recovery and distributed power supply and effective transfer through a standby power supply line after the fault point is effectively isolated;
and S3, comprehensively weighing the power recovery benefits according to the power transfer duration, the overhaul duration, the instantaneous fault probability and the load loss duration, and judging whether power recovery strategies such as reclosing and the like are adopted or not according to the power recovery benefit value.
It is to be understood that the present invention has been described with respect to certain embodiments, and that various changes, modifications, and equivalents may be made to these features and embodiments by those skilled in the art without departing from the spirit and scope of the invention; in addition, many modifications may be made to adapt a particular situation or material to the teachings of the invention without departing from the essential scope thereof. Therefore, it is intended that the invention not be limited to the particular embodiment disclosed, but that the invention will include all embodiments falling within the scope of the appended claims.
Claims (4)
1. A power distribution network protection control strategy optimization method based on real-time analysis of an operation mode comprises real-time topology analysis, real-time action analysis and real-time benefit analysis, and is characterized in that: the method comprises the following steps:
1) After the system configuration is completed, acquiring configuration parameters of the system, wherein the configuration parameters are used for describing the inherent connection relation and the element composition of the system;
2) Acquiring state parameters of the system according to the change of the system operation mode, wherein the state parameters are used for feeding back the influence of the operation mode change on a protection control strategy, and realizing an online protection fixed value setting and control decision scheme based on operation mode analysis;
3) Acquiring system operation parameters according to real-time fault conditions: monitoring the protected fault judgment signal in real time to realize real-time analysis of the operation mode;
4) Analyzing real-time network topology according to the protected fault judgment signal, and carrying out real-time switch action capacity analysis: namely, whether the switch has the fault removing capability under the current fault condition or not is judged, namely, the operability condition is judged;
5) Analyzing the matching range of the protection unit according to the fault position, the fault judgment signal actually obtained by the protection of each unit and the operability condition judgment of the switch, and optimizing the fixed value on the time sequence to form a time sequence fixed value strategy for protection;
6) And combining calculation of reclosing benefits to obtain a power restoration strategy for protection control.
2. The power distribution network protection control strategy optimization method based on real-time analysis of the operation mode according to claim 1, wherein the method comprises the following steps: the real-time topology analysis-based switch operability judgment specifically comprises the following steps:
judging the operability of a switch based on real-time topology analysis, firstly obtaining the operability of the switch of the power distribution network according to the position displacement condition of the switch of the power distribution network, and determining the topology connection relation before failure; on the basis, the distribution network fault identification information, namely the real-time fault information analysis result given by the distribution network protection identification element, is combined to determine the distribution of fault points, and finally, the operability analysis of the switch is realized according to the relation between the switch and the power supply and the fault points, specifically:
s1, describing an inherent connection relation between a switch and an element by means of a topological model node model of a network to form a node-branch connection relation matrix of the network;
s2, correcting the elements of the node-branch connection relation matrix by means of the opening and closing state information of the switch;
s3, determining a fault point according to fault identification information of the protection unit, wherein the fault point is used as a reference, and calculating the distance between each two switches by combining a corrected node-branch connection relation matrix and by means of spanning tree algorithm graph theory knowledge or minimum path algorithm graph theory knowledge;
s4, researching the relation between the switch and the power supply and the fault point according to the real-time switch distance: and judging the switching distance between each switch and the power supply point and the fault point, and when the sum of the distance between each switch and the fault point and the distance between each switch and the power supply point is equal to the distance between the power supply point and the fault point, indicating that the switch is between the power supply point and the fault point, wherein the operability of the switch is related to the characteristics of the power supply.
3. The power distribution network protection control strategy optimization method based on real-time analysis of the operation mode according to claim 1, characterized in that: the real-time action analysis specifically comprises the following steps:
protection timing sequence fixed value optimization based on action analysis
The protection units need time sequence coordination to ensure the selectivity of actions, the number/range of the protection units needing coordination determines the time sequence coordination result of protection, and the implementation method of the fixed value optimization of the protection time sequence comprises the following steps:
s1, determining the position of a fault point according to a fault judgment result of a protection unit, and determining a switching distance between the protection unit and the fault point according to real-time network topology analysis;
s2, judging whether each protection unit gives a fault judgment result or not, and judging whether each switch unit meets the operability conditions or not, wherein the protection unit is regarded as a protection range set needing to be matched only when the protection unit meets the two groups of conditions simultaneously;
s3, determining the action time sequence of protection according to the protection matching range set: starting from the switching distance of 1, determining whether all the protections with the switching distance exist in the protection units belonging to the protection coordination range set, and if so, increasing the action time of a step level; and analogizing until the maximum switch distance position, and when the protection of a certain switch distance is not in the protection coordination range set, reducing the corresponding action delay in the time sequence, thereby ensuring the coordination optimization of the protection in the time sequence.
4. The power distribution network protection control strategy optimization method based on real-time analysis of the operation mode according to claim 1, characterized in that: the real-time benefit analysis specifically comprises:
reclosing strategy based on benefit analysis
Reclosing effectively avoids the phenomenon of long-time power failure caused by instantaneous faults, but slows down the power restoration process under the condition of permanent faults, faults occur on different elements, whether reclosing is adopted or not affects the overall power restoration benefit differently, therefore, the power restoration benefit is substantially related to the operation mode of a power distribution network and fault distribution point, and the specific benefit analysis and reclosing decision selection realization process is as follows:
s1, determining a network topology before a fault, a network topology after the fault under a reclosing strategy and a network topology after the fault under a switching-over strategy based on topology analysis and action analysis under a fault condition;
s2, analyzing the load conditions under the two fault processing modes according to the network topology before the fault and the network topology after the fault under the two fault processing modes, wherein the load conditions comprise: the load which continuously maintains normal power supply, the load with a power supply transferring condition and a fault power failure load, wherein the load value which maintains normal power supply is the sum of the load quantity which always maintains power supply in the fault process and the total number of loads connected in the system, and the load size which is separated by the main power supply tripping operation is subtracted; the load value with the transfer condition is the sum of the load amount of temporary power supply maintained by main system recovery and distributed power supply and effective transfer through a standby power supply line after the fault point is effectively isolated;
and S3, comprehensively weighing the power restoration benefits according to the power supply transfer duration, the overhaul duration, the instantaneous fault probability and the load loss duration, and judging whether a reclosing power restoration strategy is adopted or not according to the power restoration benefit value.
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